White light-emitting organic electroluminescent element and white light-emitting organic electroluminescent panel

摘要

A white light-emitting organic electroluminescent element includes at least four kinds of light-emitting dopants with different emission peak wavelengths which are present between a cathode and an anode. The four kinds of light-emitting dopants include a light-emitting dopant “A”, a light-emitting dopant “B”, a light-emitting dopant “C”, and a light-emitting dopant “D” having their own peak wavelengths which are longer in this order. The white light-emitting organic electroluminescent element has an emission spectrum which satisfies relations of: (first average luminance for an angle in a range of 50° to 70°/first front luminance)>(second average luminance for an angle in a range of 50° to 70°/second front luminance); and (third average luminance for an angle in a range of 50° to 70°/third front luminance)>(fourth average luminance for an angle in a range of 50° to 70°/fourth front luminance).

主权项

1. A white light-emitting organic electroluminescent element comprising:
a cathode, an anode, and at least four kinds of light-emitting dopants including a light-emitting dopant “A”, a light-emitting dopant “B”, a light-emitting dopant “C”, and a light emitting dopant “D”, the at least four kinds of light-emitting dopants being located between the cathode and the anode, wherein a peak wavelength of the light emitting dopant “A” is shorter than a peak wavelength of the light emitting dopant “B”, the peak wavelength of the light emitting dopant “B” is shorter than a peak wavelength of the light emitting dopant “C”, and the peak wavelength of the light emitting dopant “C” is shorter than a peak wavelength of the light emitting dopant “D”, wherein when a first luminance is a luminance at the peak wavelength of the light-emitting dopant “A”, a second luminance is a luminance at the peak wavelength of the light-emitting dopant “D”, a third luminance is a luminance at the peak wavelength of the light-emitting dopant “C” and a fourth luminance is a luminance at the peak wavelength of the light-emitting dopant “B”, and when a normal direction of the white light-emitting organic electroluminescent element is in the 0° direction; a first average luminance is an average luminance of the first luminance in a range of 50° to 70°, a second average luminance is an average luminance of the second luminance in a range of 50° to 70°, a third average luminance is an average luminance of the third luminance in a range of 50° to 70°, and a fourth average luminance is an average luminance of the fourth luminance in a range of 50° to 70°, and a first front luminance is a luminance of the first luminance in the normal direction, a second front luminance is a luminance of the second luminance in the normal direction, a third front luminance is a luminance of the third luminance in the normal direction, and a fourth front luminance is a luminance of the fourth luminance in the normal direction, wherein a first ratio of the first average luminance to the first front luminance is more than a second ratio of the second average luminance to the second front luminance, and a third ratio of the third average luminance to the third front luminance is more than a fourth ratio of the fourth average luminance to the fourth front luminance.